Relieving mechanism for lathes



' w. E. INGRAM Er AL nsmsvme fincmlu ron LATHES Eiied Dec, 26, 1922 3 Sheets-Sheet 1" 1,611,037 w. E. INGHAM ET AL u RELIEVING MECHAN I SM FOR LATHEs Filed Deb. 26, 1922 i s Shee ATTORNEY w. E. INGHAM ET 1.

RELIEVING MECHANiSM FOR LATHES Filed Dec. z, 1922 s Sheets-Sheet z' lllll //IIIIII III] /IIII4 ATTORNEY 1 tool slide in any of its several adjusted posilowing specification and illustrated in the Patented Dec. 14, 1926.

.ZJUNIYTED" s CORPORATION or NEW JERSEY.

RELIEVING MECHANISM FOR LATI-IES.

WA TE E. I GHAM, or NEwInenmAuD JAMES w. IDURKEE, or HARTFORD, com NEGTICUT,.ASSIG1\TORS T0 rna'rr & wH rNEY COMPANY, on NEW Yonx, N. Y., A

Application filed December as, 1922. Serial-No. 609,030.

- This invention relates to lathes and particularly to an improved relieving attaching therefor. 1t isathe primary object of the invention to provide .such an improved;

mechanism readily applicableto an 'ordinary lathe and particularly adapted to perform exterior and interior 'relieving operations upon various. kinds of worksuch as milling cutters, hobs, taps, dies, reamers, etc.

It is an object of the invention to provide a' universal relieving attachment comprising a swivel supportand a tool slide to be mounted on the cross slide supported on the taper slide of a lathe, the support being angularly adjustable about the swivel center to any desired position, and means including a driven element coaxial of the swivel, a baroperatively connected thereto and means mounted on 'a support or housingon the rear end of the taper slide for reciprocating the bar and actuating the element to give relieving movements to the tions about the swivel axis.-

.A further object of the invention is to provide a relieving attachment comprising relief operating mechanism. adapted to cooperate with the taper slide and cross slide of a lathe, the cross slide being adapted to optionally receive thereon 'a plain tool slide slidable thereon or a swivel tool slide swivell v mounted thereon, and means for I optionally connecting the said mechanism to the plain tool slide for giving'plain relieving movements thereto orto the universal thereto in its various angular positions about the swivel axis. 'Such a construction pro vides a smgle relieving attachment adapted to optionally cooperate with a' plain or a universal tool slide whereby the manufacture and use of such mechanisms-are standardized and considerably simplified.

.lVi'ththe above and other objects in view, our invention consists in the features of construction and operation set forth in the folaccompanying drawings. Insuch drawings annexed hereto'and forming apart of this spec1ficat1on,.we have shown certain embodiments ofour invention applied to a lathe but it will be understood that the invention can be otherwise embodied and that the drawings are not to be construed as defining or limiting the scope of the invention, theclaims appended to this specification being relied upon for that purpose. I

slide supported by the carriage.

Referrin to'the figures of the drawings;

Fig. 4 is a longitudinal sectional view therethrough on line 4-4 of Fig. 3&

. Fig. 5 is a transverse sectional view on line 55 of Fig. 3. 4

Fig. 6 is a side elevation of the relief operating mechanism.

-Fig. Fig.6.

Fig. 8 is a sectional on line 8-8 of Fig. 9.

9 is a fragmentary enlargedplan view of one end of the auxiliary slide. V Fig. 10 is a fragmentary sectional viewon line 10--10 of Fig. 9.'

7 is a sectional view on line 7-7 of Y 1/ view approximately Fig. 11 is a View similar to Fig.- 3 but I I showing a plain tool slide supported by the carriage and in cooperating relation with the relieving attachment. v

Fig. 12 is a side elevation thereof partially in section on line 12-42 of .Figull.

Fig. 13 isan end elevation of the relief operating mechanism on line 13-'-'-13 of Fig. 12. i i

Fig. .14 is a transverse" sectional view on line 14*14 of Fig. 12..

-Fig. 15 is an enlarged fragmentary plan View of the gearing for operating the relieving mechanism.

Fig. 1-6 is a longitudinal sectional .view

thereof.

The relieving attachment comprising our invention is similar in some respects tothat shown in copending applications Serial Nos.

$39,523 and 539,524, filed February 27, 1922,

the mechanisms illustratdd in such applica-; 'tions lrowever each being applicable only to. I

a universal relieving tool slide anda. plain relieving tool slide respectively. As above stated our improved relieving mechanism is applicable to'both a universal and aplain tool slide. 4

In the drawings, 1 indicates the base of a lathe snpporting'a bed 2 thereon. A head stock 3' and a tailsto'ck 4 are mounted on the bed and a tool: carriage 5 is slidably mounted on" the ways of the bed. The tool carriage 5 may be moved longitudinally on its ways by means of 'ascrew 6. A lathe spindle 7 is mounted in the headstock 3 and is driven from a'motor 8 in the base as specifically disclosed in application Serial No. 513,167. Also; as illustrated iii detail in such application, a carriage and tool slide feeding shaft 9 is driven from the spindle 7. The relieving mechanism herein distaper slide 10 secured by a bolt 11 to a former or taper bar 12 riding in the groove 13 of the former ortaper attachment. It should" be understood, however, that if desired, the bolt ll'or thefltape'r attachment may be re-: moved and the taper slide secured against movement in the carriage by means ofa shoe ,14 adapted to be forced into gripping contact with the taper slide by means of a screw 15 threaded into the carriage. A cross slide 16 is mounted on the taper slide. The cross slide is adjustable by means of a hand wheel 17 and a screw 1-8 journaledin the taper slide and threadedly enga ing a nut 19 depending from the cross sli e. -A support or housing 20 is also mounted on the taper slide to the rear of the cross slide and is secured to the cross slide by means of an intermediate element 21 and bolts 22 and 23.

In Figs. 3 and 4,-a swivelsupport 24 is illustrated-as mounted on the cross slide for swivelling movement about a circular block 31 for'vertical axial movement ,jinthe support 24. Journaled centrally within the bushing is abolt 32 having a lower extension provided with rack teeththereon. A

25 seated therein. The cross slide is provided-with a T-slot 26 concentric about the block, bolts 27 in the support extending into such-slot whereby the support may be adjusted about the block as a-center and ,se-

' cured in any adjusted position. A tool slide therein is mounted the support.

28 having a tool post receiving T-slot 29;"

for. sliding movement on. At its swivel center directly over the block I 25 the support 24is provided .with an axially I movable bushing .30 having-rack teeth on one side thereof and splined by means of a key pin in the bolt '32eng ages'in a notch in the block 25 whereby such block is removable bodily with the support 24 -and bolt 32..

A gear segment 33pivoted in block-25 is in mesh with suchrack teeth and with similar rack teeth in the end of-a bar 34 slidably. mounted on the taper slide.

A gear segment 35'p1voted in the support. l

24 is in mesh with the rack teeth on-the bushx ing 30 and with a rack 86 jsec'ured'to the tool slide. 28 by means of a screw 37. The screw is journaled within a plate 3,8 mounted on the end of the slide and the screw may be rotated by means of a hand wheel 39 thereon.

'It Iwill be noted (Fig. 4) that'the screw is in threaded engagement with a portionof the rack 36 whereby rotation of the screw mover the slide 28- on the supporti24 relativejto the swivel axis 32.

Thelhonsing 20 is 'of box-like form and is adapted to seat on the rear end of the taper slide 10. A shaft 40 is mounted in the housing and on a reduced end thereof is loosely.

mounted a sleeve 41 14). A'cam' wheel 42 is keyed to one end of the sleeve and the other end thereofis formed into the outer element 43 of a frictioh clutch, the

inner element 44 of the clutch being keyed to the shaft. By tighteningthe nut 40*, the

clutch elements are secured together where,

by the cam. 42 is driven from the shaft. The shaft is driven from the before mentioned pinion 9 through gearing indicated at 45 and from .the'nce through a telescopic shaft 46 to the shaft 40. The function of the friction elements 43 and 44 .is to provide for a relative rotary adjustment be tween thecam 42 and shaft 40. v

A shaft 47 is supported vertically in a bearing 48 of the housing 20 'rearwardly of the sha ftlQ' (Fig. -8). An arcuately shaped T-head 49 is formed on the lower end'of this shaft and is provided with a T-slot 50 withinits lower face. A cross arm 51 is secured I to the shaft above thejbearing 48 by means of a screw 51". The upper end of the shaft is rotatably supported in a bearing in a plate E2secured to the housing by screws 53.

A cam follower 54 is slidably' mounted in the housing 20 .and one end thereof seats against a hardened shoe v 55 in one end of 'the cr0ss;arm-51 the other end of the follower being adapted to engage against the cam 'wheel.- A screw 56,engaging within agroove in the follower. prevents the follower from rotating. A plunger 57 mounted-in thehousingis normally forced against the other end-.of the cross ar1n751 byme'ans' of, a s pri ng,58 whereby the cross arm is normally swung about'the shaft 47 in-a directionto engage the follower'54 .with'the .cam. screw stop 59 isfmounted in the "housing for positively limiting the movement of the cross, arm in this. direction. From the mechanismjusti descrlbed, it will be seen f r that theshaft 47 is rotated positively in one direction by the cam 42 and resiliently in the opposite direction by the spring 58.

The cam follower 54 may be disengaged from the cam wheel and held so disengaged by means of a handle 60. This handle is mounted on a shaft 61 rotatable in the housing 20 and provided on itsinncr end with an eccentrically mounted lug 62 engaging within'a notch 63 inthe follower. It will be understood that the movement of the follower in operation is very slight andthe notch 63 is sufficiently large (Fig. 3) to per mit such movement freelv' without interference by the lug 62. To withdraw the follower from the dam against the action of the spring 58, the operator rotates the handle whereupon the lug 62 engages the rear wall of the notch and forces the follower rearwarclly. The operating parts of the mechanism within the housing 20 are pro-- tected by a cover plate 64 pivoted at 64 thereon. I I

Slidably mounted on the taper slide within the support or housing 20 is' an element 65. A plate or bar 66 ispivoted at 67 to one end of this element and connected by means of a screw 68 to the T-head 49 at its other end. The screw 68 threadedlvengages a T- bushing within the T-slot 50 and the screw may be rotated by means of a handle 68.

' ing the nut.

It will beunderstood that the element is reciprocated from the rocking movement of the-shaft 47 and that the amount ofv rebe varied by adjusting the screw 68 and its bushing along the T-slot 50 toward andfrom the axis of the shaft 47. Furthermore the element 65 is positively moved in one'direc-tion when the screw 68 is on one side of the shaft 47 and is positively moved in .the opposite direction when the screw is on the other side of such shaft. The element 65 maybe clamped to thebar- 34 by means of a bolt 69 having a head 70 to engage against the'bar. A bushing 71 on the threaded end of the bolt extends through an elongated opening 72in the housing 20; This bushing forms a thrust; bearing be tween the element 65 and the nut 69 whereby the head- 70 may be drawn into clamp.-- ing engagement with. the bar by tighten thereof cooperating with such graduations.

The purpose of these graduations istoprm vide means whereby the screw 68 may be accurately adjusted and set the proper position along the slot 50 for giving the V desired amount of relieving movement.

'- Since the graduated pro'ection 73 moves about the-axis of shaft-47 and the indexfio post 74 moves with the bar 66 about the pivotal axis 67, the shaft/47 arid the bar 66 must be brought to a mid position with the axis 67, the zero on the projection 73 and the index mark on the post 74 in align? 75 ment (Fig. 9.), when .it is desired to adjust the screw along the T-slot 50 to accurately provide for the proper amount of relieving movement. A vertically sliding block 75 is provided for holding the shaft 47 in this position. The block may be lifted vertically by means of a pin 76 seated therein and extending through an elongated slot 77 in the housing. To seat the block in position for thus holding the shaft 47', the operator forces the cam follower in a direction to compress the spring 58 and leave an openingbetween the arm 51 and the housing. The block 75 is then lift-ed upwardly from the position shown in Fig. 8 to extend between W the block to be gripped between the said arm and housing with the .arm in the said mid position. Upon the continued opera.- tion of the cam, after the screw 68 has been adjusted and set. the cam follower moves the arm in a direction to compress thespring-- 58 and the block 75 drops down out of path of movement of the cam."

The mechanism as thus far described comprises a universal relieving attachment which may perform either plain or universal relieving operations. sembled as shown in Figs. 3'and 4 of the drawings, the following adjustments are made thereto: The taper slide may either be secured tothe taper bar12by the bolt 11 the The mechanism being asor to the carriage 5 by means of the "screw I 15. The shaft 47 and post 74 are placed in the mid 'position as above described and the screw 68 is adjusted along the slot 50 and set in the desired position. The distance of such screws from the'axis of shaft 47 determines the amount of relieving movement given and it should furthermore be understood that for external relieving operations the screw is adjusted to oneside of such axis and for internal relieving operations the screw is adjhsted to the opposite side thereof. The tool is adjusted to the work by rotating the hand wheels 17 andSt).

t The rotation of the shaft 40 and cam 42 together with the spring 58 rocks the shaft 47. A reciprocating-movement is transmitted to the element 65 and bar 34 by means of the bar 66 connecting the element 65 with the I-head 49. The reciprocation of bar 34 operates through the gear segment 33 to reciprocate the bushing 30 vertically, the tool slide 28 being reciprocated therefrom through the gear segment 35 and rack 36.

It will be understood that the swivelsupport 5 24 together with the tool slide 28 and bushing 30 may swivel bodily to any degree about the pin 32 and that the connection from the cam 42 to the tool slide 28 remains operative in all such positions.

As heretofore stated, the relieving attachment comprising this invention as above stated, is adapted to be used in connection with either a universal tool slide or a plain tool slide. In Figs. 11 to 14 of the drawings, 5 we have illustrated the same relieving attachment above described operatively connected to a plain tool slide 78 supported on the cross slide 16. A handle 79 mounted on a screw within the tool slide. 78 rovides 20 means for moving such slide on t 1e cross slide.

When using the relieving attachment in connection withithe plain tool slide 78, as

shown in Figs. to 14, the support instead of being connected-to the cross slide is connected to theftaperbar 12 bymeans of tap bolts 80, the bolt 11 connecting the taper slide to the taperbar of course being removed. A cover plate 81 is mounted over the end of the support or housing 20 in place of the connecting ,element 21 shown in Figs. 3 and 4. Furthermore the element 65 instead of being connected to the bar 34 is connected to the taper slide by means of a bolt 35 .82 having a hook-shaped head 83. Otherwise the mechanism is the same as illustrated in Figs. 3 to 10 inclusive. .7

The operation of the mechanism shown in Figs. 11 to 14 as follows: The support 20 O with its shaft and cam wheel 42 is anchored to the taper bar. The rotation of the cam 42 reciprocates the element which reciprocates the taper slide and the cross slide and tool slide thereon. The reliefoperating mechanism is adjusted for internal and external relieving and for varying the amount of relieving movement in the manner heretofore described. It will furthermore be noted that since the support 20 is connected to the taper bar 12, the work will be relieved along a line conformlng to the adjustment of the taper guideway 13. i

In Figs. 1, 2, 15 and 16, we have illus-- 55 'trated in detail the gearing, indicated ge'ner-.

ally at 45, for driving the relieving mechanism 'through the telescopic shaft 46. A supporting housing 84 is secured to the lathe bed by means of bolts 85. A pair of shafts 86 and 87 are rotatably mounted in this housing, the shaft 86 being directly connected. to the telescopic shaft 46. Shafts 86 and 87 are operatively connected together by gears 88 and 89. Mounted for rotary ad- JHStIIlGIlt on a bushing about theshaft 87is a change gear bracket. arm 90. A bolt/91 is position. A stud 92 adjustably mounted in a.

radial T-slot in the arm rotatably supportsa bushing thereon carrying gears, 93 and 94, gcar94 being in mesh with ,a gear95 on the shaft 87. An arm 96 o'nthe' housing supports a gear 97 in mesh with the pinion 9 011- the feed shaft 9. The arm may be ad-. justed about the shaft 87 in a manner to mesh its gear 93 with this gear 97 wherebya driving connection is established from the feed shaft 9 to the telescopic shaft 46.

It will be understood that the rotation of the telescopic shaft 46 relative to the feed shaft 9 may be changed as desired bymeans so of the change gears 93, 94 and 95. Furthermare, when it is not desired to use the relieving mechanism the gear 93 may be withdrawn from meshing engagement with the gear 97 merely by loosening the bolt 91. The housing is provided with a cover plate 98- pivoted thereon whereby easy access to the gearing is assured.

The direction of feed of the tool carriage and tool slide is dependent upon the direction of rotation of the feed shaft 9. Since the relieving mechanism is driven from this shaft, the relieving operations of the tool will always follow the feeding movement of the tool and tool carriage, in whichever direction such movement may be.. Such arrangeinent is of particular advantage when operatingon spiral fluted hobs or milling cutters since the tool is always held in correct relation to the cutter teeth being relieved. Furthermore, the speed of relieving movementrelative to the spindle rotation may be changed as desired by means of the change gears 93, 94 and whereby hobs having any number of flutes may be accurately relieved.

What we claim is:

1. In combination with a lathe compris ing-a bed, a tool carriage slidable thereon,

a taper slide on the carriage, a cross 'slide on the taperrslide and a tool slide on the cross slide, of a support on the taper slide secured to the cross slide, a bar extending longitudinally of the taper slide'and operatively connected to the tool slide, and means on the sup-port for reciprocating the bar to give relieving movements to the tool slide.

2. In combination with a. lathe compris-' ing a bed, a tool carriage slidable thereon, a taper slide on the carriage, a cross slide on the taper slide and a tool slide on the cross slide, of a support on the taper slide secured, to the cross slide, .a bar extending longitudinallyof the taper slide and operatively connected toth tool slide, means on the support including a rotary cam for reciprocating the bar to give relieving movements to the tool slide, and means .for varying the length of relieving movement imparted to the tool slide. a

combination with a lathe CO P zijbedfa tool carriage slidable thereon,

.-a taper slide-on the carriage and a cross slide on the taper slide, of a tool slide swivelly supported on the cross slide, a support on the taper slide secured to the cross slide, a tool slide actuating element arranged coaxially of the swivel and operatively connected to the'tool slide, a bar extending longitudinally of the taper slide and operatively connected to the element, and means on the support for reciprocating the bar to give relieving movements to the tool slide.

4. In combination with a lathe comprising a bed, a tool carriage slidable thereon, a-

I swivel and operatively connected to the tool slide, a bar extending longitudinally of the taper slide and operativelyoonnected to the element, and means in the housing including a rotary cam operated by the said gearing for reciprocating the bar to give relieving movements to thetool slide.

5. In combination with a lathe comprising a bed, a tool carriage slidable thereon, a taper slide on the carriage and a cross slide on the taper slide, of a tool slide swivelly supported on.the cross slide, a support on the taper slide secured to the cross slide, an axially movable tool slide actuating element arranged coaxially of, the swivel and operatively connected to the tool slide, a bar extending longitudinally of the taper slide and 'operatively connected to the element, and means on' the support for reciprocating the bar and element to give relieving movements to the tool slide.

6. In a relieving attachment for a lathe, the combination with a bed, a tool carriage thereon and a cross slide on the carriage, of a tool slide-on the crossjslide, a bar extending along the cross slide and operatively connected tothe tool slide, and means at one end 0d the bar for reciprocating the bar to give- 'lelievingmovements to the tool slide relative to the cross slide.

.7. In a relieving attachment for a lathe,

, the combination with a bed, a tool carriage thereon and a cross slide on the carriage, of

a tool slide on the cross slide, a bar extending along the cross slide and operatively connected to the tool. slide, and means at one end-'ofthe bar including a cam for positively moving the bar in one directionand a spring for moving thebar in the opposite direction to giverelieving movements to the tool slide.

8;. In a reIieving attachment 'for a lathe,

the combination with-a bed, a" tool carriage thereon and a cross slide on the carriage, of

a tool slide on the cross slide, a bar extending along the cross slide and operatively con-- nected to the tool slide, means at one .end of g the bar including a cam for positively moving the bar in one direction and a spring for moving the bar in the opposite direction to give relieving movements to the tool slide and'means for adjusting the lastnamed 'means to direction.

9. In a relieving attachment fora lathe, the combination with a bed, a'tool carriage thereon and a cross slide on the carriage,- of a tool slide on the cross slide, a bar extending along the cross slide and operatively 30 connected to the tool-slide, means including a rotary cam at one end of the bar for reciprocating the bar in opposite directions to give relieving movements to the tool slide, and means for rendering the cam inoperative on the bar.

10. In a relieving attachment for a lathe, the combination with a 'bed,'a tool carriage thereon and a cross slide on the carriage, of a tool slide on the cross slide, a bar extend-' ing along the cross slide and operatively connected to the tool slide, a pivotally mounted element connected to the cross slide, means operatively connectingthe bar to the element, the last said means being ad- 'justable "toward and from the pivotal axis of the element whereby to vary the amount of relieving movement imparted to the tool slide, and means for rocking the element about its .pivotal axis. a I

11. In a relieving attachment for a lathe, the combination with a bed, a tool carriage thereon and a cross slide on the carriage, of a tool slide on the cross slide, a bar extending along the cross slide and opera-tively connected to the tool .slide, a pivotally mounted element connected to the bross slide, means operatively connecting the bar to the element, and means for rocking the element I about its rection,the first named means being adjustable to-opposit s ides of the pivotal axis of the element whereby to reverse the direction of positive relieving movement imparted to the tool slide.

12.. In a relieving attachment for a lathe, the combination with a bed, a tool carriage thereon "and a cross slide on the carriag of a tool slide on the crossvslide, a bar extending along the cross slide and operatively connected to the tool slide,"a pivotally mounted element connected to the cross slide, means operati'vely connecting the 'bar tothe element, andfmeans including a rotary cam for rocking the element about its pivotal axis,'the first named means being adjustable toward and from the pivotal axis of the element whereby to vary the relievingmovee ment imparted to the tool slide. I g l 'f lfi a'relie'vin'g attachment for a lathe,

pivotal axis'positively. in one di- 110 I the combination with a bed, a tool-carriage combination of a slide, a swivel support thereon and a cross slide on the carriage, of thereon, a tool slide mounted for slidinga tool slideon'the cross slide, a bar extendmovement on the support, an element aring along the cross'slide and operatively conranged coaxially of the swivel, means 111 the 5. nected to the tool slide, a rotary cam, a drive first said slide ,operatively connected to the 70 shaft rotating the cam, a cam follower coelement for reciprocating the same axially' operating with the bar and adapted to enin both directions, and mechamsin connecte the cam for giving relieving movements i'ng the tool slide with. the elementtor reto the tool slide, and means for rotatably ciprocating the tool-slide, the support bemg 10 adjusting the cam relative to its driving *angularly adjustable about the swivel axls (5 shaft. r j and the sever-ah elements being operative to 14:. In a relieving attachment for lathes, reciprocate the tool slide in the various adthe combination with a bed, a tool carriage justed positions of the support. thereon, a taper slide on the"carriage, a 19. A relieving mechanism comprls ngthe Y 15 cross slide on the taper slide and a tool slide combination ot a slide, a swlvel support 80 on the cross slide, of a movable element on the reon, a tool slide mounted tor shdmg the taper slide, means on the taper slide'for movement on the support, an element armoving the element positively in one direcranged coaxially of. the swivel, a slldlng 1 tion, means for moving the element in the rack in the first said -slide operatwely conopposite direct-ion, and means for connecting nected to the element tor reciprocating the 86 the element either tothe taper slide for giv- S me axially, an eeha sm l clll lngj & I ing relieving movements thereto or to the r and PiI'I I Ct1I g he E 91 Sll tool slide for giving relieving movements with the element tor reciprocating the tool thereto on the cross slide. I q slide, the support being angularly adjust- Si 15. In a'relievingattachment for lathes, able bou he swivel a s and he several 0 the combination with a bed, a tool carriag elements being operative to rec1procate the thereonfa taper slide on the carriage, a tool slide in the, various ad usted positions crossslide on the tapenslide and a tool slide 0f the support. on the cross slide, of a movabl l t on 20. A relieving mechanism comprising the 80 the taper slide, means for reciprocating the Combination of i S11de,; a swivel support 05 element, means for varying the t f thereon, .a tool slide mounted for slidmg such reciprocation, and means for conn etmovement onv the support, an element aring the element eitherto the taper slide for ng d aigially of the swivel, means in the giving relieving movements thereto or to first said slide operatlvely connected to the-- 8' the tool slide for giving r li i moveelement for reciprocating the same axially, 100

ments thereto on th cross lid mechanism connecting t e tool slide with 16, .In a relieving attachment for lathes, the element for reciprocating the tool Slide, the combination with a bed, a tool carriage and mechanism f r Operating t Said means thereon, a taper slide on "the carriag a to reciprocate the element positively in oross' slide on the taperslide and a't ol either direction and resiliently in the'other 105 slide on the cross slide, of a movable element direction, the support being angularly ad.- on the taper slide, a support on the taper justable about the swivel axis and the'sevslide, means including a cam on the superal parts being operative to reciprocate the port for reciprocating the element, and tool slide in the various adjusted positions means for operatively connecting the ele- Of the supp rt- Il ment to the tool sli'e for giving relieving 21. A relieving mechanism compri ing the movements thereto on the cross slide or rigcombination of a slide, a swivel support ldly connecting the element to the taper thereon, a tool slide mounted for sliding slide for giving relieving movements theremovement on the support, an element arto. ranged coaxially of the swivel, means in 115 17. Ina relieving attachment for lathes, the first said slide operatively connected to the combination with a bed, a tool carriage the element for reciprocating the same ax th r o -a t e lid on th i g a Cross ially, mechanism connecting the tool slide slide on the taper slide and a tool slide on with the element for reciprocating the tool the cross slide, of a support on the taper slide, mechanism for operating the said 120 slide, an element'slidable on the. taper slide means, and means for varying such operaw1th1n the support, means including a cam tionto vary the extent of the said reciproon the support and aspring for reciprocatcation, the support beingangularly adjusting the element, and means for operatively I able about the swivel axis and the several connectin the element to the tool slide for parts beingloperative to reciprocate the tool 125- giving relieving movements thereto on the slide in the various adjusted positions of cross slide or rigidly connecting the elethesupport. ment to the taper slide for giving relieving 22.'A relieving mechanism comprising the, movements thereto. combination of a slide, a swivel support 18. A relievingmechanism comprising the thereon, a tool slide mounted for sliding movement on the support, anelement aran intermeshing rack and pinion on the tool slide, a screw operatively connecting the rack to .the tool slide, and rack teeth on the said element engaging the pinion, the sup port being angularly adjustable about the swivel axis and the several elements being operative to r iprocate the tool slide in the 'various adjuste positions of the support.

In testimony whereof, we hereto allix our signatures.

WALTER E. INGHALL- JAMES W'. DURKEE. 

